浅埋煤层房采破坏区充填复采技术研究与应用

Research and application of filling remining technology in room mining failure area of shallow coal seam

针对浅埋煤层前期开采遗留的大量房采破坏区严重影响现阶段工作面正常开采的问题,以五家沟煤矿5-1号煤层15301工作面的赋存情况和开采条件为研究背景,采用煤矿探巷机器人和机载三维激光扫描系统,探查出靠近15301辅运巷道三个房采区的情况,对房采破坏区失稳机理进行研究,确定了破坏区支护强度,通过对充填材料不同配比实验,同时结合填充效果的探查结果,提出了安全快速通过充填区技术。研究与实践表明:当破坏区支护强度P_(k)≥2.1 MPa时,可避免房采破坏区失稳;确定了满足五家沟煤矿充填的主体材料为充填料Ⅰ,其中,水泥、粉煤灰掺入比例为3∶7,水灰比为1∶(0.8~1.2);对房采区进行充填后,利用安全快速通过充填区技术,顺利完成了15301工作面房采破坏区充填复采,取得了良好的技术与经济效益,为类似条件下的浅埋煤层开采提供技术借鉴。

Aiming at the problem that a large number of room mining failure areas left by the early mining of shallow coal seams seriously affect the normal mining of the working face at this stage,taking the occurrence and mining conditions of the 15301 working face of No.5-1 coal seam in Wujiagou Coal Mine as the research background,the coal mine exploration robot and the mounted three-dimensional laser scanning system were used to explore the three room mining areas near the 15301 auxiliary transportation roadway.The instability mechanism of the room mining failure area was studied,and the support strength of the failure area was determined.Through the experiment of different proportions of filling materials,the reasonable filling scheme was determined.Combining with the exploration of filling effect,a technology was proposed for safe and rapid passing through the filling area.The research and practice show that when the support strength P_(k)≥2.1 MPa in the failure zone,the instability of the failure zone can be avoided.It is determined that the main filling material is filling materialⅠwith cement and fly ash mixing ratio of 3∶7 and water cement ratio of 1∶(0.8~1.2),which is the main material to meet the filling of Wujiagou Coal Mine;after the filling of the room mining area,the technology for safe and rapid passing through the filling area was used to complete the filling and remining of the room mining failure area,and favorable technical and economic benefits were obtained.